Abstract
Increasing areal densities on the order of I Gbit/in2 in magnetic disk drives demands the use of supersmooth disk substrates which can, however, lead to a severe sticlion problem. A practical solution involves the creation of bumps in a dedicated landing zone near the disk inner diameter using a focused laser beam. The tribological performance of the laser-textured disk depends on the size and number of bumps on its surface. A large number of asperities (bumps) can result in high sticlion force. On the other hand, to prevent plastic deformation, the number of asperities must be greater than a certain number. A statistical contact model has been developed to generate design curves for estimating the critical number of asperities as a function of asperity radius which can prevent both plastic deformation and severe sticlion. Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in San Francisco, California, October 13–17, 1996
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